1) Autocomplete on keypress should be set to False by default.

2) Update the documentation for the locked option in user management.

web/pgadmin/tools/sqleditor/utils/query_tool_preferences.py

@@ -679,7 +679,7 @@ def register_query_tool_preferences(self):
 
     self.preference.register(
         'auto_completion', 'autocomplete_on_key_press',
-        gettext("Autocomplete on key press"), 'boolean', True,
+        gettext("Autocomplete on key press"), 'boolean', False,
         category_label=gettext('Auto completion'),
         help_str=gettext('If set to True, autocomplete will be available on '
                          'key press along with CTRL/CMD + Space. If set to '